perf/x86/amd: Do not print an error when the device is not present

As Linus said its not an error to not have an AMD IOMMU; esp.
when you're not even running on an AMD platform.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Link: http://lkml.kernel.org/r/20130703075542.GF23916@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/kernel/cpu/perf_event_amd_iommu.c b/arch/x86/kernel/cpu/perf_event_amd_iommu.c
index 0db655ef39188917c4d114cf509ba783513cff2e..639d1289b1ba9a16cc7b9684d3697f5b79df0d27 100644 (file)
--- a/arch/x86/kernel/cpu/perf_event_amd_iommu.c
+++ b/arch/x86/kernel/cpu/perf_event_amd_iommu.c
@@ -491,10 +491,8 @@ static struct perf_amd_iommu __perf_iommu = {
 static __init int amd_iommu_pc_init(void)
 {
        /* Make sure the IOMMU PC resource is available */
-       if (!amd_iommu_pc_supported()) {
-               pr_err("perf: amd_iommu PMU not installed. No support!\n");
+       if (!amd_iommu_pc_supported())
                return -ENODEV;
-       }
 
        _init_perf_amd_iommu(&__perf_iommu, "amd_iommu");